Advent Puzzles 2014: puzzle 13 solution

Advent puzzle 13: 1?2?3?4?5?6?7?8?9?10?11?12?13=12345. Replace each ? with one of +−×÷ to complete the equation. Operator precedence applies

— Portsmouth MathsJam (@MathsJamPOR) December 13, 2014

$1-2+3+4\div5-6-7+8\times9\div10\times11\times12\times13=12345$

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